Send Magnus to the Dragon's Clutch to explore, find at least 1 silver wire, and make a pair of silvery gloves with it at the Tailor.
Now, Magnus loves the tangy taste of tarts. His next part of the quest will require us to have a lemon tree in our kingdom. Harvest the lemon tree twice to get 6 lemons and make 3 lemon tarts at the Bakery.
The last part of the quest wants you to make a torch at the Woodshop and an opal dragon horn ring at the Jeweler. Once you have the necessary items (1 opal dragon horn ring, 1 pair plain gloves, 3 torches) to explore Dragon Ruin with Magnus, send him there to explore and talk to Violetta (the big purple dragon that lives there).